| bg;fg | after CTRL Z , restart in background; bring to foreground again | |
| cat | * | concatenate and display |
| cc | C compiler | |
| cd | * | change working directory |
| chmod | * | change the permissions mode of a file |
| compress,
uncompress |
* | compress & uncompress files |
| cp | * | copy files |
| csh | a shell (command interpreter) with a C-like syntax | |
| echo | echo arguments to the standard output | |
| ex | line editor | |
| f77 | * | Fortran compiler |
| find | find files by name;or by other characteristics | |
| finger | display information about users | |
| ftp | file transfer program | |
| grep | search a file for a string or regular expression | |
| jobs | display state of background jobs | |
| kill | send a signal to a process;or terminate a process | |
| ld;ld.so | link editor;dynamic link editor | |
| login | log in to the system | |
| lp;cancel | send/cancel requests to a printer | |
| ls | * | list the contents of a directory |
| make | maintain;update;and regenerate related programs and files | |
| man | display reference manual pages; find reference pages by keyword | |
| mkdir | make a directory | |
| passwd | change local or NIS password information | |
| ps | * | display the status of current processes |
| pwd | display the pathname of the current working directory | |
| rm;rmdir | * | remove (unlink) files or directories |
| tar | * | create tape archives;and add or extract files |
| telnet | user interface to a remote system using the TELNET protocol | |
| vi | display a count of lines;words and characters whatis - display a |